EventHorizan:
The rig is 3'x 6' ( Lowes), space used is about 5'x7'. Won't lie, 20 COB DIY setup will cost you.
For what you see, maybe about $1200, including another 4 COB rig in a 2'x4'
The 3070s GreenGenes 200 Watt tutorial, the 3590s GrowMau5 V kit from Cutter.
Since I built this, the availability of COB kits/parts has increased (cost going down) over several months.
The build is easy. Lowes, Radio Shack and Amazon. As one can see I did the basics, nothing
fancy. Works for me. This run the nutes used... Jacks 321. 10 gal res, 6 tsp, 4 tsp, 2 tsp...
can't get any simpler. Ya see the results.
Hope this helps.
Stay safe!!
Success w/ya grow!!!